<template>
<el-container class="home-container">
  <el-header>
      <div>
          <img src="../assets/heima.png" alt="">
          <span>后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
  </el-header>
  <el-container>
      <!-- 侧边栏 -->
    <el-aside :width="iscollapse ? '64px':'200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边菜单栏 -->
  <el-menu background-color="#333744" text-color="#fff" active-text-color="#409EFF"
     unique-opened :collapse="iscollapse" :collapse-transition="false"  router :default-active="activePath">
        <!-- 一级菜单 -->
      <el-submenu :index="item.id+''" v-for="item in menulist" :key="item.id">
        <!-- 一级菜单模板区域 -->
        <template slot="title">
            <!-- 图标 -->
          <i :class="menuicon[item.id]"></i>
          <!-- 文字  -->
          <span>{{item.authName}}</span>
        </template>
        <!-- 二级菜单 -->
         <el-menu-item :index="'/'+subItem.path " 
         @click="saveNavState('/'+subItem.path)" 
         v-for="subItem in item.children" :key="subItem.id">  
         <template slot="title">
          <i class="el-icon-menu"></i>
          <span>{{subItem.authName}}</span>
        </template>
        </el-menu-item>
        </el-submenu>
    </el-menu>
    </el-aside>
    
    <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
    </el-main>
  </el-container>
</el-container>
</template>

<script>
export default {
    created(){
        this.getMenuList(),
        this.activePath = window.sessionStorage.getItem('activePath')
    },
    data(){
       return {
           //左侧菜单数据
           menulist:[],
           menuicon:{
             125: "iconfont el-icon-user-solid",
             103: "iconfont el-icon-message-solid",
             101: "iconfont el-icon-s-goods",
             102: "iconfont el-icon-s-order",
             145: "iconfont el-icon-s-marketing",
           },
           iscollapse: false,
           //被激活的链接地址
           activePath:''
       }
    },
   methods:{
       logout(){
        //清空token，路由跳转到登录页面完成退出功能
           window.sessionStorage.clear()
           this.$router.push('/login');
       },
       saveNavState(activePath){
            window.sessionStorage.setItem('activePath',activePath)
       },
       //获取所有菜单
       async getMenuList(){
       const {data:res} = await this.$http.get('menus')
       if (res.meta.status!==200)
       return this.$message.error(res.meta.msg)
       this.menulist= res.data
       },
       //点击按钮,切换菜单的折叠和展开
       toggleCollapse(){
           this.iscollapse=! this.iscollapse
       }
   }
}
</script>

<style Lang='less' scoped>
.home-container{
    height: 100%;
}
.el-header{
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color:#fff;
    font-size: 20px;
}
 .el-header div {
        display:flex;
        align-items:center;
    }
 .el-header span{
            margin-left: 15px;
     }
.el-aside{
    background-color: #333744;
}
.el-aside .el-menu{
     border-right: none;
}
.el-main{
    background-color: #eaedf1;
}
.iconfont{
    margin-right: 10px;
}
.toggle-button{
    background-color: #4a5064;
    font-size: 10px;
    line-height: 20px;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
}
</style>